Class: Dante::Runner

Inherits:
Object
  • Object
show all
Defined in:
lib/dante/runner.rb

Defined Under Namespace

Classes: Abort

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name, defaults = {}, &block) ⇒ Runner

Returns a new instance of Runner.



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# File 'lib/dante/runner.rb', line 29

def initialize(name, defaults={}, &block)
  @name = name
  @startup_command = block
  @options = {
    :host => '0.0.0.0',
    :pid_path => "/var/run/#{@name}.pid"
  }.merge(defaults)
end

Instance Attribute Details

#description ⇒ Object

Returns the value of attribute description.



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# File 'lib/dante/runner.rb', line 21

def description
  @description
end

#name ⇒ Object

Returns the value of attribute name.



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# File 'lib/dante/runner.rb', line 21

def name
  @name
end

#options ⇒ Object

Returns the value of attribute options.



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# File 'lib/dante/runner.rb', line 21

def options
  @options
end

Class Method Details

.run(*args, &block) ⇒ Object 



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# File 'lib/dante/runner.rb', line 24

def run(*args, &block)
  self.new(*args, &block)
end

Instance Method Details

#execute(&block) ⇒ Object

Executes the runner based on options



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# File 'lib/dante/runner.rb', line 47

def execute(&block)
  parse_options

  if options.include?(:kill)
    kill_pid(options[:kill] || '*')
  else # create process
    Process.euid = options[:user] if options[:user]
    Process.egid = options[:group] if options[:group]
    @startup_command = block if block_given?
    options[:daemonize] ? daemonize : start
  end
end

#parse_options ⇒ Object 



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# File 'lib/dante/runner.rb', line 80

def parse_options
  headline = [@name, @description].compact.join(" - ")
  OptionParser.new do |opts|
    opts.summary_width = 25
    opts.banner = [headline, "\n\n",
                  "Usage: #{@name} [-p port] [-P file] [-d] [-k]\n",
                  "       #{@name} --help\n"].compact.join("")
    opts.separator ""

    opts.on("-p", "--port PORT", Integer, "Specify port", "(default: #{options[:port]})") do |v|
      options[:port] = v
    end

    opts.on("-P", "--pid FILE", String, "save PID in FILE when using -d option.", "(default: #{options[:pid_path]})") do |v|
      options[:pid_path] = File.expand_path(v)
    end

    opts.on("-d", "--daemon", "Daemonize mode") do |v|
      options[:daemonize] = v
    end

    opts.on("-k", "--kill [PORT]", String, "Kill specified running daemons - leave blank to kill all.") do |v|
      options[:kill] = v
    end

    opts.on("-u", "--user USER", String, "User to run as") do |user|
      options[:user] = user
    end

    opts.on("-G", "--group GROUP", String, "Group to run as") do |group|
      options[:group] = group
    end

    opts.on_tail("-?", "--help", "Display this usage information.") do
      puts "#{opts}\n"
      exit
    end

    # Load options specified through 'with_options'
    instance_exec(opts, &@with_options) if @with_options
  end.parse!
  options
end

#start ⇒ Object 



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# File 'lib/dante/runner.rb', line 60

def start
  puts "Starting #{@name} service..."

  trap("INT") {
    stop
    exit
  }
  trap("TERM"){
    stop
    exit
  }

  @startup_command.call(self.options) if @startup_command
end

#stop ⇒ Object

Raises:



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# File 'lib/dante/runner.rb', line 75

def stop
  raise Abort
  sleep(1)
end

#with_options(&block) ⇒ Object

Accepts options for the process



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# File 'lib/dante/runner.rb', line 40

def with_options(&block)
  @with_options = block
end